Valve



F. w. LEEVERS.

VALVE. APPLICATION FILED SEPT. I9, 1921.

Patqnted Apr. 25,1922

v 2 SHEETSSHEET a M wm 0 m M 0 F. WfLEEVERS.

-VALVE. APPLICATION mm SEPT. 19, 1921.

Patented Apr. 25, 1922.

2 SHEETS-SHEET 2.

Fig.

WWW E m Wb MW R F. 5 m M r 'FBEDEBIC WILLIAM IiEEVERS, oF"no1nvsE Y ,lnNGi1A1vn.

' vALvE."

Specification ofLetters Bat entf Patented Ap1' ,.'25-, 1922 Application filed September 19,1921. Serial No. 501,507."

To all whom it may concern:

LBB it known that '=I,'FREDERIO WILLIAM Lnnvnns, a subject of the King of Grreat Britain, residingfat 60 Park Avenue North,

.Hornsey, N. 8,:England, have invented certain new and useful Improvements Valves, of which the following is a specification.

This invention relates to improvements in valves for steam, gas, water or the like of the type in which the closing member consists of a pair of discs which are raised and lowered by means of a carrier attached to a valve spindle, the discs being forced apart when the carrier isin, or approaches, its

lowest position so as to cause them to seat themselves firmly over the entrance and exit of the valve chamber. Firstly such valves have hitherto been proposed in which the discs rotate after reaching a position in line with the centres of the exit and entrance while they are being forced apartso as to seat themselves; with a concentric bedding action. This has been accomplished byproviding a boss on the inner side of each valve disc the two bosses being provided with helically engaging surfacesadapted to-slide over each other so that the discs rotate owing 'toeccentric pins on. the valve discs engaging'slots in'the carrier-and acting as cranks which are turned during the dow n ward movement of the carrier. Secondly such valves 'have also been proposed in which the two discs areffo-rced on to the valve seats by means of wedge arrangements but without anymeans for rotating the d scs when these are in a position concentricwith the bore of the valve.

The object of the present invention is to improveand simplifythe mechanism of the first mentioned type of valve and to provide means whereby the discs while being thrust on to the seats are given a concentric beds ding. action in the second mentioned or 45 wedge operated types of valves and to that end it consists in providing a rounded or ner sides ofthe discs;engaging -slotsformed 111 the gca'rrier so'that the 'discs' are rotated while thewedge is being forced between the "rounded: bosses and the discs are forced on 'i to their seats and'rotate simultaneously.

The accompanying drawings illustrate one method of carrying this invention intoef- .fectyl ig'l being a sectional sideelevation through a valveyFig. 2 is a sectional plan,

Fige3 is a sectional endelevation andFig; '4 a sectional-viewof a modified form of valve.

111 carrying myinvention into eii'ect ac Figs. 1 to 31 provide a'pair of discs 1 hav- 'ingjprojeetions 2 (Fig. 3) on the periphery- "cording to the j'inodific'ation illustrated in On-theinner side of each disc I 'provide'a central boss 3with a conical or spherical surface; and eccentric pins 4100mm preferably partly onjthe disc andpartly on one :of' the projectiiig'portions' 2. s The carrier '5 -may beformed integral with or maybe securedto the valve spindle 6 and is: provided with a central recess containing a Wedge shaped men1'ber"'7 which projects between;

the two bosses3 formed'on"the discs. The.

carrier 'is' also provided. with: arms 8. which are formed slots which are slightly 'largerthan the eccentricpinsl so that-there is some lost motion between the'pin's" and the slots When 'closingthe' valve the discs 1 are prevented'from rotating owing to the plane surface 'of the' valve disc in contact with the guides 9 formed in the valve cas- -ing between which they slide and can only rotate when they reach their lowest position with their centres in line with the centres of the entrance and exit to thevalve chamber. WVhen this position is reached the projections 2 on the periphery ofthe valve disc have left the lowest point of the plane.

surface of the guiding members 9 and may now enter the circular part of the guide,

since the arc bounding the projections 2 and the circular part of the guide are arcs l l of concentric. circles, the'jformer of-a slightly smaller diameter to allow suflicient clearance for rotation so that a further movement of the valve spindle 6 causes the carrier to descend thereby forcing thewedge shaped member 7 between the bosses3 on the valve discs and causing them to'move apart. At the same time the pins 4 are engaged by the'slots in the arms 8 of the carrier 5 introducing a turning movement about the axis through the center of the discs thus causing the discs 1 to rotate so that as they are forced apart and on totheir seats they do so with a rotary bedding action. 7

In opening the valve, owing to the 10st motion between the pins 4 and the slots, the wedge shaped member 7 is slightly withd awn before the underside of the slots engage the pins at thereby releasing the pressure from the valve faces before there is any tendency for the discs to be rotated. This prevents any possibility of jamming or of causing the discs to score or otherwise damage the valve seats, further the discs complete rotation before they move from the central position.

In the modification illustrated in Fig. 4, I may do away with the lower projections on the discs and provide one or two thrusters or stops 10 which hang loosely in the carrier 5 until the discs take up a position central with the bore of the valve, when in this position these thrusters arrest further downward movement of the discs and act as fulrcrums upon which the discs rotate.

What I claim as new and desire to secure by Letters Patent of the United Eitatesis 1. In a valve, the combination of a valve casing, a valve dlsc, an operating splndle, a guide for preventlng rotation of said valve disc during a predetermined downward movement,a valve disc carrier, means associated with said valve disc for arresting its downward movement, and means connecting the carrier and valve disc-for rotating the said disc during the seating operation.

2. In a valve, the combinationof a valve casing, a valve disc, an operating spindle, a

guide for preventing rotation of said valve disc during a predetermined downward movement, a valve disc carrier having an arm, lntegral pro ect1ons extending along a part of the periphery of said valve disc for arresting its downward movement, and means engagingthe CllSC carrier arm with the valve disc for rotating the said disc during the seating operation.

3. In a valve, the combination of a valve casing, a valve disc, an operating spindle, a guide for preventing rotation of said valve 'disc during a predetermined downward valve disc for arresting its downward movement, and means connecting the carrier and valve disc for rotating the said disc during the seating operation.

4. In a valve, the combination of a valve casing, valve discs, means associated with said valve discs for arresting their downward movement, a guide for preventing r0 tation of said valve discs during a predetermined downward movement, a carrier having awedge-shaped valve disc operating portion interposed between the valve discs for imparting lateral displacement simultaneous with the rotary seating operation at the ultimate downward travel of said valve discs during. astraight line movement of the carrier, a valve disc carrier arm having openings on opposite sides, and means connecting the carrier arm and valve disc for rotatlng said discs.

; 5. In a valve, the combination of a valve casing, a valve disc, an operating spindle, a

guide for preventing rotation of said valve disc during a predetermined downward movement, a valve disc carrier having an arm, means associated with said valve disc for arresting its downward movement, and

a lost motion connection permitting the valve disc to be released from 'itsseat before rotation of the valve'disc on opening the valve.

In witness whereof I have hereunto set my hand this 5th day of September 1921.

.FREDERIC WILLIAM LEEVERS. 

